SOLUTION: It takes susan 6 hrs to paint her room if she works alone and it takes jill 4 hours to paint the same room if she works alone. How long will it take them to paint the room if they

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Question 166045: It takes susan 6 hrs to paint her room if she works alone and it takes jill 4 hours to paint the same room if she works alone. How long will it take them to paint the room if they work together? Please show how to work this problem. I cannot figure out the formula.
Thank you.
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!

The formula is: product of their individual times (6*4) divided by the sum of their individual times (6+4).
6*4/(6+4)=24/10=2.4 hours when they work together.